What Is No Mow May?
No Mow May is a grassroots conservation campaign that started in the United Kingdom and spread to North America in the early 2020s. The idea is simple: stop mowing your lawn for the entire month of May. This allows dandelions, clover, violets, and other early bloomers to flower, providing critical nectar and pollen to bees, butterflies, and other pollinators emerging from winter dormancy.
The movement gained traction because spring is the hardest time for pollinators. Managed landscapes with weekly mowing remove nearly every food source right when these insects need it most. A single unmowed lawn can produce thousands of flowers that would otherwise be cut before they open.
Does No Mow May Actually Help Pollinators?
Research from Lawrence University in Appleton, Wisconsin found that lawns participating in No Mow May had five times more bee species than regularly mowed lawns during the same period. A 2022 study published in the journal Ecological Entomology confirmed that unmowed urban lawns supported significantly higher pollinator diversity through May and into early June.
The impact is real but localized. Your unmowed lawn helps the pollinators that visit it. The cumulative effect scales with neighborhood adoption. Even partial participation, such as leaving one section unmowed, provides measurable benefit compared to mowing everything on schedule.
How No Mow May Affects Your Lawn
The trade off is real and worth understanding before you commit. Here is what happens to your turf during a month without mowing.
Cool Season Grasses (Kentucky Bluegrass, Fescue, Rye)
May is peak growth season for cool season grasses in the Central Plains. Without mowing, your lawn will reach 6 to 10 inches by month end. The grass blades will flop over and shade the crown, which can thin the turf. You will likely see some yellowing at the base where light gets blocked.
The bigger risk is the first mow after May. Cutting more than one third of the blade height at once stresses the plant and can cause brown out. A lawn that grew to 8 inches cannot be cut to 3 inches in a single pass without damage.
Warm Season Grasses (Bermuda, Zoysia, Buffalo)
Warm season grasses are just coming out of dormancy in May across the Central Plains. The impact is less dramatic because growth rates are slower in early May. However, bermuda and zoysia spread aggressively and a full month without mowing can create thatch buildup that takes weeks to correct.
A Practical Middle Ground
You do not have to choose between pollinators and lawn health. Several approaches capture most of the pollinator benefit with less turf damage.
| Approach | Pollinator Benefit | Lawn Impact | Best For |
|---|---|---|---|
| Full No Mow May | High | Moderate to significant | Homeowners willing to do recovery work in June |
| Zone mowing (unmow 30% to 50%) | Moderate to high | Low | Most homeowners |
| Raised mowing height (4 to 5 inches) | Low to moderate | Minimal | HOA restricted areas |
| Clover integration | High (all season) | Positive | Long term pollinator support |
Zone mowing is the most popular compromise. Designate the backyard, a side strip, or any area not facing the street as your no mow zone. Mow the front at 4 inches to keep the appearance tidy while still letting some flowers bloom.
How to Transition Back to Mowing After No Mow May
The recovery mow is where most people make mistakes. Do not cut everything down in one pass. Follow this graduated approach instead.
During the first week of June, set your mower to its highest setting and make one pass. This typically removes about 2 to 3 inches. Wait 3 to 4 days for the grass to recover. Then lower the deck one notch and mow again. Repeat until you reach your target mowing height, which should be 3 to 3.5 inches for cool season grasses or 1.5 to 2.5 inches for warm season grasses.
This graduated approach takes about 2 weeks but avoids the shock of removing 60% to 70% of the blade in a single cut. If your lawn was already thin going into May, consider overseeding the bare spots in September rather than trying to force recovery in summer heat.
No Mow May in the Omaha Metro
In our experience managing lawns across the Omaha metro since 1991, May is the single most active growth month for the Kentucky bluegrass and tall fescue blends that dominate local yards. Soil temperatures in the Omaha area typically hit 55 degrees in late April, which triggers rapid top growth through May.
The practical concern for Omaha homeowners is that a full no mow May coincides with pre emergent herbicide timing. Most pre emergent applications happen in April, and their effectiveness is not affected by mowing schedule. However, skipping mowing can allow weed seedlings that break through the pre emergent barrier to establish more quickly in the taller canopy.
Our recommendation for Omaha area homeowners: try zone mowing your first year. Leave the backyard or a designated pollinator patch unmowed while maintaining the front at 4 inches. Evaluate how your turf responds before committing to a full unmowed property the following year.
Common Concerns About No Mow May
Will My HOA Allow It?
Most Omaha metro HOAs have maximum grass height requirements, typically 6 to 8 inches. Full No Mow May participation will exceed this threshold by mid month. Check your covenants before committing. The raised mowing height approach (4 to 5 inches) usually stays within compliance while still supporting some pollinator activity.
Will It Attract Pests?
Taller grass does harbor more insects, but that is the point. The vast majority are beneficial. Tick populations do increase slightly in unmowed areas, particularly near wooded edges. If ticks are a concern in your area, focus your no mow zone on sunny open areas rather than shaded perimeters.
Does No Mow May Replace Regular Lawn Care?
No. This is a one month pause on mowing only. Continue watering if needed, maintain your irrigation system, and resume your fertilizer schedule in June. No Mow May is not an excuse to neglect your lawn. It is a deliberate pause with a specific ecological purpose.
